Details

Autor(en) / Beteiligte

• Wang, Jizhong
• Xiao, Hongqing
• Lu, Longtao
• Yang, Junlong
• Lu, Shiwei
• Shayanfar, Javad

Titel

Axial stress-strain model for concrete in partially FRP wrapped reinforced concrete columns

Ist Teil von

• Construction & building materials, 2024-02, Vol.416, p.135028, Article 135028

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• The application of fiber-reinforced polymer (FRP) composites has become a commonly-used technique for the strengthening/retrofitting of existing reinforced concrete (RC) columns. To date, extensive experimental studies have been conducted in this field, resulting in many stress-strain models of FRP-confined concrete for analysis or design use. Few models, however, are concerned with the concrete in FRP-confined RC columns, especially for the columns under partial FRP confinement. This paper first investigates the mechanical properties of the concrete under FRP strip-transverse steel reinforcement composite confinement via the assessment of existing analysis-oriented models (AOMs). Then, the peak stress of actively confined concrete and the dilation model in AOM are calibrated based on existing research, leading to a new AOM for FRP strip-steel confined concrete. Finally, a test database is assembled to evaluate the reliability of the new model in terms of the predictions of ultimate conditions and stress-strain curves. By comparing the experimental results and theoretical predictions, the proposed model exhibits higher accuracy for the FRP strip-steel confined concrete compared with the other existing models. •Hoop strain relationship between FRP strips and transverse steel reinforcement was investigated.•Parameters affecting the axial compressive behavior of partially FRP-confined reinforced concrete columns were discussed.•A new axial stress-strain model was developed for concrete in partially FRP-confined reinforced concrete columns.